It's likely to take five or more years for the ranks of the long-term unemployed to return to a more normal level. With the unemployment rate remaining stubbornly high and job creation anemic, the number of would-be wage earners who have been out of work for a year or more is ballooning. It's risen from 668,000 when the recession began at the end of 2007 to the current tally of 4.3 million -- nearly 3% of the labor force and almost three times the previous post-World War II high of 1% in 1982.

That time, it took about five years for the number of long-term unemployed Americans to recede to its prerecession total. This time, there's reason to believe the tide will take longer to ebb. One reason: In the roughly 60 months since the inflated housing market crested, about 2 million jobs in construction have disappeared. Although housing construction will gradually recover, it won't return to bubble levels for a couple of decades, at least. As a result, many of today's unemployed construction workers may never earn a paycheck again. Moreover, the longer someone is out of work, the less likely he or she is to return to the workplace. Job skills atrophy, especially in fields that require computer use or other rapidly evolving technology.

What's more, following this recession, the spectrum of workers finding themselves out of work for a prolonged period is broader than in the past. Just 35% of those now counted among the long-term unemployed were working in factories before the recession. In the downturn of the early 1980s, 55% of those with no jobs for a year or more came from factories. This time, a greater portion were earning their livings in finance, insurance, real estate and business services. The ratio of college graduates is higher now, too.

The fact is, "natural unemployment" has probably crept up in recent years. In the late 1990s, many economists considered the nation to be at full employment with a jobless rate around 4% -- just enough to account for folks moving between jobs plus enough slack to prevent wage inflation. Now economists figure that the benchmark is about 5.5% unemployment, maybe even 6% -- closer to what had been considered natural unemployment through most of the previous two decades. Odds are it'll stay near that higher percentage for years, long after the economy is operating at full steam.

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That's a bum deal on two scores. Having a larger share of the workforce unable to find jobs at any given time keeps pressure on government to spend more on the social safety net -- not just jobless benefits but also Medicaid, food stamps and more. And more long-term unemployed means millions of shoppers staying away from malls, auto dealerships, restaurants and other businesses.

The outlook isn't good. Almost one-third of today's jobless have been out of work for more than one year. Even though the economy is improving, job creation remains sluggish. It will be several months before employers can be counted on to consistently add 130,000 net new jobs a month, and that will only match growth of the labor force from immigrants and young folks just starting out. To bring the unemployment rate down will take sustained net job growth of much more than that.

Why are there so many long-term unemployed this time around? First and foremost, it's because this recession threw a whopping 8.4 million people out of work -- compared with 2.9 million in the early 1980s. In addition, hiring in this recovery has been slower than in all other postwar economic recoveries.

It's also possible that extending unemployment benefits beyond the standard 26 weeks -- as Congress has done several times -- discourages people from trying to find work. Critics of lengthier benefit periods cite the national average of 90 weeks of benefits in the current recession and recovery versus an average of 55 weeks in 1983. But Federal Reserve economists say that even without the extended benefits, the number of long-term unemployed would total at least 3 million, still a record.